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• Boots (outer) , chemical-resistant, steel toe and shank <br /> • Boot covers (outer) , chemical-resistant, disposable (optional) <br /> • Hard hat (face shield optional) <br /> • Escape mask (optional) <br /> • Two-way radio communications (optional) - inherently safe <br /> b . Criteria for selection <br /> Meeting all of these criteria permits use of Level C Protection: <br /> • Oxygen concentrations are not less than 19 . 5 percent by <br /> volume. <br /> • Measured air concentrations of identified substances will be <br /> reduced by the respirator below the substance ' s threshold <br /> limit value (TLV) , and the concentration is within the <br /> service limit of the canister. <br /> • Atmospheri.c contaminant concentrations do not exceed IDLH <br /> levels . <br /> Atmospheric contaminants, liquid splashes, or other direct <br /> contact will not adversely affect any body area left <br /> unprotected by chemical-resistant clothing. <br /> • Job functions do not require self-contained breathing <br /> apparatus. <br /> • Direct readings are a few ppms above background on <br /> instruments such as the FID or PID. <br /> 4 . Level D Protecti.Qn <br /> a . Personal protective equipment <br /> • Coveralls <br /> • Gloves (optional) <br /> • Boots/shoes, leather or chemical-resistant, steel toe and <br /> shank <br /> • Safety glasses or chemical splash goggles (optional) <br /> • Hard hat (face shield optional) <br /> 10-12 <br />